For those looking for sealed battery solutions

Packhorse

Packhorse

Flashlight Enthusiast
Joined
Nov 29, 2007
Messages
1,912
Location
New Zealand
Cool! But not really practical :(
voltage and current levels are too low and the coils need to be very close.
 
J

jspeybro

Enlightened
Joined
Aug 13, 2009
Messages
586
Location
Belgium
I agree, the distance is just too small.
and also it just provides current, so you probably need more than just the battery pack. Other than that I could see interesting applications outside dive lights.
 
Norm

Norm

Retired Administrator
Joined
Jun 13, 2006
Messages
9,512
Location
Australia
I don't think creating your own would be too difficult, larger coils should raise the efficiency and current handling.

Norm
 
DIWdiver

DIWdiver

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Joined
Jan 27, 2010
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2,715
Location
Connecticut, USA
I worked on one once. It's harder than it looks. The coupling is so poor you have to jump through some serious hoops to get any usable power. Notice how the coils are carefully and neatly wound, and bonded.

Bigger coils would help, but these are already fairly good sized for some flashlights. What else would help is if you could get he proper magnetic core halves to make it a gapped core rather than full air core.

If I were interested in toying around, I would buy these and use a DC/DC convertor to get the output I wanted. It would be a much easier job than a scratch build.
 
Klem

Klem

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Joined
Mar 26, 2010
Messages
581
Location
Perth Australia
Perhaps you could get it to work but I've never been a big fan of sealed units. Corrosive off-gassing and humidity trapped in the container (you could purge as much of the humidity as possible no doubt). It would be helpful if you could have a way of opening it up from time to time for servicing, without destroying it.
 
Packhorse

Packhorse

Flashlight Enthusiast
Joined
Nov 29, 2007
Messages
1,912
Location
New Zealand
An OPV would vent gas. But from what I understand Li Ion does not off gas anyway.
 
D

darkavenger

Newly Enlightened
Joined
Apr 6, 2013
Messages
27
I think you could couple them better with magnets, or rather a magnet and an iron disk. The coils would be rather easy to wind, but I'm not sure about the circuitry...

Also, you could get the coils to almost touch if you potted the coil in a small recess in the outside of the body of the light.
 

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